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r in (-oo:+oo)
4/7 = r/35 // - r/35
4/7-(r/35) = 0
4/7-1/35*r = 0 // - 4/7
-1/35*r = -4/7 // : -1/35
r = -4/7/(-1/35)
r = 20
r = 20
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